The moment of change.
BEFORE
Lower TTLs a day in advance Confirm the new site is fully tested Confirm every DNS record exists at the destination
THE SWITCH
Change nameservers at your registrar to those shown in your Client Area.
Or, if keeping DNS elsewhere, change the A records.
HOW LONG IT TAKES
Usually within an hour. Occasionally up to forty-eight.
DURING PROPAGATION
Some visitors reach the old server, some the new.
Keep both running.
For a shop, check both for orders.
WHAT TO DO IMMEDIATELY AFTER
Confirm the domain resolves here Run AutoSSL Test the site Test mail, both directions
RUNNING AUTOSSL
Only after the domain resolves here. Certificates cannot be issued for a domain we do not serve.
WHAT TO MONITOR
The site, for the first day Mail, specifically Error logs
